Overview

This compact system uses membranes to treat drinking water with high efficiency and provide clean water.

Features

High-quality, safe treated water
Combining back pressure washing and air scrubbing/washing makes physical washing possible, and the system can be stably operated for a long period of time.

Clean treated water
The system of course removes E. coli and bacteria, but also removes cryptosporidium and viruses.

Conserves space
There is no need for floc formation tanks, sedimentation tanks, or sand filtration tanks that are necessary for drinking water treatment equipment that uses the coagulation sedimentation method, so this system conserves space.

Easy pre-treatment
Using an external pressure-type module creates a large gap between the casing, so pre-treatment is easy and the system can handle raw water with high turbidity.

Reduced operating cost
This is a full filtration system, so no power is needed for circulation, which reduces the power cost.

Operation is easy to manage
Fully automatic operation is possible, so operation is easy to manage.

Construction time can be shortened
Unitizing the equipment reduces the on-site work and shortens construction time.

(in-house comparison)

System & device summary

Our membrane system is different from other systems in these respects:

Our membrane system

Water pass-through system

External pressure system

Water flow: Flows from the outside of the membrane to the inside
Suspended matter: Adheres to the outside of the membrane

There is a large gap between the casing and the membrane, so pre-treatment is easy and the system can handle raw water with high turbidity.

There is a large membrane area per membrane module unit of volume.

Operating system

Full filtration (dead-end) type

The full amount of water is filtered, without circulating membrane supply water.

Washing system

Back pressure washing system

Reversing the treated water from the inside of the membrane to the outside knocks out the contaminants clogging the fine holes of the membrane and the contaminants on the surface of the membrane.

Air washing method (air scrambling)

Sending air from the bottom of the membrane module causes the sides of the membrane (configured in a U-shape) to rub together, which knocks off the contaminants from the surface of the membrane.

Combining the two methods thoroughly washes the membrane.

Membrane material

Polyacrylonitrile

We use polyacrylonitrile (PAN) because it can be used in a wide pH range and doesn't degrade due to hydrolysis or bacterial attacks.

Competitors' membrane systems

Water pass-through system

Internal pressure type

Water flow: From the inside of the membrane to the outside
Suspended matter: Adheres to the inside of the membrane

Sufficient pre-treatment is required to prevent clogging.

Sufficient care needs to be taken when using this on raw water with high turbidity.

There is a large membrane area per membrane module unit of volume.

Operating system

Circulation filtration (cross-blow) type

In this system, a flow is created parallel to the membrane surface, and filtration is performed while controlling the build-up of suspended solids from the membrane supply water along the membrane surface.

Washing system

Raw water is flushed along the outside of the membrane, which knocks off contaminants adhering to the membrane surface.

Back pressure washing system

Membrane material

Cellulose acetate

This is an organic membrane, so the membrane may become degraded by hydrolysis or bacterial attacks.